DP강의 페라이트 핵생성 속도에 미치는 Si의 영향The Effect of Si on the Nucleation Kinetics of Ferrite in Dual Phase Steels
- Other Titles
- The Effect of Si on the Nucleation Kinetics of Ferrite in Dual Phase Steels
- Authors
- 이상환; 이경종
- Issue Date
- Jul-2007
- Publisher
- 대한금속·재료학회
- Keywords
- dual phase steels; Si; ferrite transformation; nucleation rate
- Citation
- 대한금속·재료학회지, v.45, no.7, pp.389 - 396
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- 대한금속·재료학회지
- Volume
- 45
- Number
- 7
- Start Page
- 389
- End Page
- 396
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/179824
- ISSN
- 1738-8228
- Abstract
- It is generally accepted that Si promotes kinetics of polygonal ferrite due to thermodynamic factors such as undercooling (increase of Ae3) and maximum amount of ferrite formed. However, in this study, it was found that the difference between the measured rates of ferrite formation in C-Mn steel and Si added steel was much larger than that expected considering only thermodynamic factors. The classical nucleation theory with pillbox model was adopted to figure out what is the most controlling factor in formation of ferrite. The volume free energy change was calculated by use of the dilute solution model. The diffusivity of carbon was formulated as functions of C and Si by using experimental data. It was found that the volume free energy change was still predominant but the kinetic factors such as interfacial energy and the diffusivity of carbon by addition of Si were not negligible at lower undercoolnig. However, with increasing undercooling, the diffusivity of C was the most effective on the ferrite kinetics, though the ambiguity of treating interfacial energy was not yet clear.
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